If I have the right numbers, it seems to me that even Hubble telescope might barely be able to make out a carcass of a blue whale on the surface of the moon, which puts objects as small as the lunar rovers or the American flag left there by Apollo out of range. Hubble is often lauded as the best telescope we have built. I know a large part of that is because it is in space where it's free from all of the interference of the atmosphere, but is there any ground-based observatory with better resolution? Is there any place on Earth where I could point a scope at the Sea of Tranquility and see what we left there over 40 years ago?

...an array of telescopes or mirror segments acting together to probe
structures with higher resolution by means of interferometry. The
benefit of the interferometer is that the angular resolution of the
instrument is nearly that of a telescope with the same aperture as a
single large instrument encompassing all of the individual
photon-collecting sub-components.

It also must be noted that probably this wouldn't be the best idea for watching the moon rovers since:

The drawback is that it does not
collect as many photons as a large instrument of that size. Thus it is
mainly useful for fine resolution of the more luminous astronomical
objects, such as close binary stars.